Hondata

Ok guys i have a few questions.First of all i tuned my car with a very well known tuner who has quite a bit of experience with hodas and hondata.I really feal like he knows what hes doing as this is what he does for a living and has a great reputation.My problem as stated above is that a perfect a/f ratio turned into a very rich a/f ratio when i arrived back in my city.Their is a slight diffrance in temperature here, along with elevation and humidity.So i thought this may have bean a factor but it may not have bean after all.He then tell me that the stock 1volt 02 sensor is not very accurate.He says i should buy a 5 volt 02 sensor to be for sure what my a/f really is.Now im still a newb but have never heard anything about this from any member here.So im confused as to why he says this should be done.Now the car was tuned with a 5 volt 02 sensor on a dyno.Could that be why mine and his a/f differs so much.I just really want to know why i went from a 13.1 - 13.5 to a mid 11.00 a/f.

Now if wideband sensor on the dyno may be off by a point from my sensor how do you truly know what the correst a/f ratio is.

Is your car NA or forced induction?

n/a

It is possible that your O2 sensor is getting old or has been contaminated. If you have ever run laded fuel (race gas) this is most likely the case. Did your tuner use only the sensor in your car when tuning, or did he use an external wideband as well? It is also possible that you need to adjust your IAT correction tables.

He used only a external wideband only.He stated that the stock 02 sensor is not accurate enough.But ive never heard of that before.Ive already began to retune the calibration but am curious how my a/f ratio went down 2 whole points.I thought it could be a temperature compensation problem but dont even know how to begin to adjust that.

Before making changes, you may want to verify the readins by putting the car on the dyno where you are to see if the sensor is giving improper readings or if something has changed.